Is this the same R200 that's in the Q?

Post by **AZhitman** » Wed Aug 13, 2003 4:13 am

Can anyone tell if this is the same rearend as is in the Q?

Post by **sijoko** » Wed Aug 13, 2003 4:13 am

The case might be same but the internals are different. The Q has a 6 bolt stub axle.

You might be thinking, "All I need to do is swap out the stub axles. "

I thought the same.

I went to the junkyard and picked up an R200 from a 94 J30. Externally, it is identical to the diff on my Q, except for the stub axles being 5 bolt and the input flange being smaller.

So I attempted to swap the stub axles. Guess what?

I was a no-go.

The gears on the inside are different. The stub axles are different.

I could not get the stub axles from the Q45 to fit into the R200 from the J30 because the ones from the Q are thicker. They won't fit without modifications.

I am sorry to be the bearer of bad news. But, don't give up hope.

There is a company in Cali. called UNITRAX that will install the 4.08 gears into your Q45 differential. Speak with Devin.

Post by **AZhitman** » Wed Aug 13, 2003 4:13 am

sijoko - This one is from a 300ZX n/a.

Are you looking at the 5-star axle flange? Because the general consensus is they're interchageable (Q to Z and vice versa). Not doubting you, just wondering if the J30 rearend is a different one (as I've heard they're NOT interchangeable with the Q).

Post by **Mayhem_J30** » Wed Aug 13, 2003 4:13 am

i can say the n/a 300Z and the J30 have different gear ratios for some reason.

Post by **Aries** » Wed Aug 13, 2003 4:13 am

To the best of my knowledge the NA 300Z rear end will be a bolt in replacement on a Q45. You will however have to use the 5 point axleflange on the Q instead of the 6. Haven't tried this myself mind you, but this is what I get from reading.

Alos, I agree that the J30 rear end is strange, it's imputs are geared slightly different, and more like a 240SX R200. This is because they both have series 3 carriers. The 300ZX NA has a series 2 carrier similar to the Q45's.

Post by **sijoko** » Wed Aug 13, 2003 4:13 am

I don't know if the stub axles from the Q would bolt up to the R200 from the 300zx NA.

If I were to guess, I would say no.

Since the horsepower ratings are almost the same between the J30 and the 300zx NA, the stub axles between the cars are probably the same. It doesn't make sense for Nissan to re-engineer the same part if there is no need.

Now, maybe the differential from a 300zx TT might bolt up or at the least the stub axles can be swapped. I say this only because the torque output of the Q and the Z32 TT are similiar.

But, I have read on a few sites that the 300zx TT uses a R230V differential. I don't know if that is correct or not.

The only sure way to find out is to try the swap.

Or you could call up our friends at Infiniti of Scottsdale and have them cross reference the stub axles between the 300zx NA and the 93-94 J30.

Post by **Aries** » Wed Aug 13, 2003 4:13 am

sijoko wrote:But, I have read on a few sites that the 300zx TT uses a R230V differential. I don't know if that is correct or not.

It sure does

Post by **AZhitman** » Wed Aug 13, 2003 4:13 am

Just got off the phone with Joe. he said the n/a 300ZX and the Q both use the 6-bolt flange. However, the flange is available to purchase, so I'm thinking I just change the axle flanges? He added that the stub axles look identical.

Now I'm wondering why this pic shows a 5-bolt flange?

Any idea if this is a big task?

Post by **Aries** » Wed Aug 13, 2003 4:13 am

can he run the TT model?I'll bet it's a TT rear end with 3.83's and that's why it has 5-bolt falnges...

Post by **AZhitman** » Wed Aug 13, 2003 4:13 am

Hmmmm.

The guy with this rear SWEARS it's a 4.083. Interesting.

Aries, how difficult is it to swap the flanges, and how are they held in place?

Post by **sijoko** » Wed Aug 13, 2003 4:13 am

The 300zx NA came with a 4.08 ratio and the TT came with 3.69 gears.

The case for the 300zx NA is different from the differentials on the Q45s. The Q diff case has a flange on the pass side of the case where the ABS sensor is attached. The case for the 300zx NA doesn't have that spot.

Due to this, there is probably a small difference in overall length between the two. Which one is shorter or longer? I don't know.

Does that mean you can't swap it in? Maybe. Perhaps there is enough slack in the driveshaft of the Q to compensate.

Here is another 4.08 diff to look at. This one shows the other side. Look at the area near the input flange.

http://cgi.ebay.com/ebaymotors...50723

Post by **AZhitman** » Wed Aug 13, 2003 4:13 am

Hmmmm. Aries, whatta ya think?

Let's get Dennis in here for the final word... We've been hashing this question for three years, and it'l be good to get it figured out.

BTW, that's a nice looking unit, but I ain't spending that much.

Post by **AZhitman** » Wed Aug 13, 2003 4:13 am

OKAY - After much debate, this is where we're at and what we know for certain:

1) The 90-96 300ZX n/a and the 90-96 Q45 share the same rearend (R200), with the Z using a 4.08 ratio.

2) The Q appears to have six-bolt axle flanges, whereas the Z has five bolt flanges.

3) At some point, for one year, the Z was produced with 6-bolt flanges, but that rearend was notoriously weak and therefore discontinued.

4) 4.08's in a Q would be a great mod for the $$$.

Here are some pics of the Q rearend: Sorry for the poor angles, it's hard to crawl under her now that she's dropped on Eibach's.

Post by **Q45tech** » Wed Aug 13, 2003 4:13 am

You still have the problem of 3 channel vs 4 channel ABS in non traction/non active Q.

We never swap types because of driveshaft/half shaft length. We have tried to use [change the flanges when junk yards sent the wrong unit] gave up waste of time.

Internal gear swap is the best but the precision and labor makes this an 8 hour job once the diff is out on the bench, if you want 100k life.

We have no customers with a 4.083 other than Fred, have swapped a few SC400 with SC300 diff.

Post by **maxnix** » Wed Aug 13, 2003 4:13 am

Q45tech wrote:We have no customers with a 4.083 other than Fred.

Now that's a non-endorsement of the rear end swap.

Post by **AZhitman** » Wed Aug 13, 2003 4:13 am

Well, Fred's 4.08 is on life support, so now you have none.

3 vs 4 channel ABS: Can you tell me more? I take it the Z has 3 channel, Q has 4?

What's the difficulty in swapping some 6-flanges onto the Z rear, keeping same axle stubs?

Post by **sijoko** » Wed Aug 13, 2003 4:13 am

" 2) The Q appears to have six-bolt axle flanges, whereas the Z has five bolt flanges."

This is the part that I would be most concerned about. Will the stub axle from the Q fit into the diff. from the Z32 n/a ?

The J30 diff. also has 5 bolt stub axles. But they are smaller in diameter. Therefore, the Q stub axles cannot be swapped in.

Now, the cases for the J and Q are identical. But it's the stuff on the inside that is incompatible.

Somebody has to get hold of the Z32 diff and attempt to swap out the stub axles. It is pretty easy to do with a heavy slide hammer and the proper adaptor. Pop out the drivers side first and then use a brass drift and to tap out the other side.

Also, as Q45tech mentioned, you still have a problem with the ABS setup.

Post by **Q45tech** » Wed Aug 13, 2003 4:13 am

The standard Q has 3 channel ABS [because the LSD allows this to work].......the LSD works the same on deceleration as acceleration.The traction Q [even though both rear brakes are applied simultaneously] and active Q have 4 channel. Whereas the 300zx is always 4 channel . The traction and ABS share a common bigger smarter computer in that version.

So if you have traction and or Active then the swap is easier at least you have the same number/same location of ABS rings and sensors on the diff.

Post by **Aries** » Wed Aug 13, 2003 4:13 am

agreed.Now the question stands... Do you have an active Q or a standard Q?The flanges are easily transfered, and can be purchased at any dealership. The worry is in the sensors now.

Personally, I would simply have a gear made for the car, but as Greg and I discussed, that simply isn't affordable for the common driver looking for a bit more pickup from their Q. My question then stands...With both units being series 2 carriers inside the diferential, would it not stand to reason then to simply change the internals from a Z32 to your Active Q? Ring, Pinion, and carrier with all clutches should be easily removed if care is taken, and should only require you to remove the stubs, and 4 retaining bolts inside at which time everything would slide out. Now the pinion would have to be pressed back in to the new differential, but would this not be a reasonable option?

Post by **AZhitman** » Wed Aug 13, 2003 4:13 am

Hmmm. That's a good idea - Then you're not necessarily changing the relationship of the ring to the pinion (or are you?) which avoids all that alignment nonsense.

I have a non-active, non-TCS Q, so mine will likely have the 3-channel ABS. Is there then an issue of swapping something else?

Post by **Nismo_Freak** » Wed Aug 13, 2003 4:13 am

Hmm... looks like your gonna run into a few issues.

Easiest methods, would be to have someone install the 4.083 gears, or disable the ABS, swap flanges, and put it in. Both of which have their ups and downs.

Post by **AZhitman** » Wed Aug 13, 2003 4:13 am

Doing a gear swap is out of the question - I don't want Quella to sing like Pavarotti (or click like Freddy's current diff).

Can't disable ABS for liability reasons (and because it's a bad idea overall).

Damn the 3 vs. 4 sensor issue!!!

Post by **Aries** » Wed Aug 13, 2003 4:13 am

hmmm...I'm gonna jump on some of my techies over at Mossy Nissan here in Houston and see if we can get a diagram of the inside of the Q diff on your car Greg...

Post by **AZhitman** » Wed Aug 13, 2003 4:13 am

Bless you my friend!

Post by **Nismo_Freak** » Wed Aug 13, 2003 4:13 am

Aries wrote:hmmm...I'm gonna jump on some of my techies over at Mossy Nissan here in Houston and see if we can get a diagram of the inside of the Q diff on your car Greg...

Parts has to have a view of the rear end exploded.

Post by **Aries** » Wed Aug 13, 2003 4:13 am

Nismo_Freak wrote:Parts has to have a view of the rear end exploded.

Exactly my thought.They're supposed to fax me an exploded view of both rear ends thisafternoon.

Post by **HeavyDuty** » Wed Aug 13, 2003 4:13 am

ttt

Post by **HeavyDuty** » Wed Aug 13, 2003 4:13 am

S.W.A.G. here, I should probably wait until I get the thing & start poking around, but, it *might* stand to reason that if i would up with a diff that had two abs rings, that I could leave one in as a plug & only attach one from my car (non-a non-tcs).

It's just a Hall Effect sensor, right? certainly there's not different values from a 3 channel to a 4, right? Even if I had to change the connector?

I shouldn't hypothecize any further until I get it, perhaps.

Post by **vq35de** » Wed Aug 13, 2003 4:13 am

The R200 is alive and well in the G and 350Z with a 3.5, 3.8 and a 3.9 ratio available (the 3.9 is aftermarket from EVO, the 3.8 is Z roadster OEM)

One of those is called the R200 V (I think that is the 3.8 for the roadster)

Add'ly there is a partial how to with part numbers and pics up at G35 driver.com, including the axle flanges you have to buy.

Post by **vq35de** » Wed Aug 13, 2003 4:13 am

more info on the G35 swap here for pics of the axle spline tubes and their part numbers.

http://g35driver.com/forums/sh...=&sb=

and here for oil seal and bearing part numbers:http://g35driver.com/forums/sh...13525

again this is a 3.5 G35 R200 rear end

Is this the same R200 that's in the Q?

Is this the same R200 that's in the Q?

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